<template>
  <el-container class="home-container">
    <!-- 头部 -->
    <el-header>
      <div>
        <img src="@/assets/heima.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 主体 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单 -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409eef"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="false"
          router
          :default-active="activePath"
        >
          <!-- :default-active="$route.path" -->
          <!-- 一级菜单 -->
          <el-submenu
            v-for="items in menuList"
            :index="items.id + ''"
            :key="items.id"
          >
            <!-- 一级菜单模板区域 -->
            <template slot="title">
              <i :class="iconsObj[items.id]"></i>
              <span>{{ items.authName }}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item
              v-for="item in items.children"
              :index="'/' + item.path"
              :key="item.id"
              @click="saveNavState('/' + item.path)"
            >
              <template slot="title">
                <i class="el-icon-menu"></i>
                <span>{{ item.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右边主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  created() {
    this.getMenuList()
    // 方案1 选中高亮
    this.activePath = window.sessionStorage.activePath
    // 方案2 选中高亮
    // this.activePath = this.$route.path
  },
  data() {
    return {
      menuList: [],
      iconsObj: {
        '125': 'iconfont icon-user',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao'
      },
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  methods: {
    logout() {
      window.sessionStorage.removeItem('token')
      this.$router.replace('/login')
    },
    // 获取所有的菜单
    async getMenuList() {
      let { data: res } = await this.$http.get('/menus')
      // console.log(res);
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
    },
    // 点击按钮，切换菜单的折叠
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState(activePath) {
      console.log(activePath);
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }

  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  font-size: 20px;
  color: #fff;
  background-color: #373d41;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-right: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  box-sizing: border-box;
}
.el-menu {
  border-right: none;
}
.iconfont {
  margin-right: 10px;
}

.el-main {
  background-color: #eaedf1;
}
.toggle-button {
  font-size: 10px;
  line-height: 24px;
  background-color: #4a5064;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>